1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.dialogs.relation;
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3 |
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4 | import java.util.List;
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5 | import java.util.concurrent.CopyOnWriteArrayList;
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6 |
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7 | import javax.swing.event.TreeModelEvent;
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8 | import javax.swing.event.TreeModelListener;
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9 | import javax.swing.tree.TreeModel;
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10 | import javax.swing.tree.TreePath;
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11 |
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12 | import org.openstreetmap.josm.data.osm.Relation;
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13 | import org.openstreetmap.josm.data.osm.RelationMember;
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14 |
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15 | /**
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16 | * This is a {@link TreeModel} which provides the hierarchical structure of {@link Relation}s
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17 | * to a {@link javax.swing.JTree}.
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18 | *
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19 | * The model is initialized with a root relation or with a list of {@link RelationMember}s, see
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20 | * {@link #populate(Relation)} and {@link #populate(List)} respectively.
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21 | *
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22 | * @since 1828
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23 | */
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24 | public class RelationTreeModel implements TreeModel {
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25 | /** the root relation */
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26 | private Relation root;
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27 |
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28 | /** the tree model listeners */
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29 | private final CopyOnWriteArrayList<TreeModelListener> listeners;
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30 |
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31 | /**
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32 | * constructor
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33 | */
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34 | public RelationTreeModel() {
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35 | this.root = null;
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36 | listeners = new CopyOnWriteArrayList<>();
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37 | }
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38 |
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39 | /**
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40 | * Replies the number of children of type relation for a particular
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41 | * relation <code>parent</code>
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42 | *
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43 | * @param parent the parent relation
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44 | * @return the number of children of type relation
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45 | */
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46 | protected int getNumRelationChildren(Relation parent) {
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47 | if (parent == null) return 0;
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48 | return (int) parent.getMembers().stream().filter(RelationMember::isRelation).count();
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49 | }
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50 |
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51 | /**
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52 | * Replies the i-th child of type relation for a particular relation
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53 | * <code>parent</code>.
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54 | *
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55 | * @param parent the parent relation
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56 | * @param idx the index
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57 | * @return the i-th child of type relation for a particular relation
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58 | * <code>parent</code>; null, if no such child exists
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59 | */
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60 | protected Relation getRelationChildByIdx(Relation parent, int idx) {
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61 | if (parent == null) return null;
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62 | int count = 0;
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63 | for (RelationMember member : parent.getMembers()) {
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64 | if (!member.isRelation()) {
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65 | continue;
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66 | }
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67 | if (count == idx)
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68 | return member.getRelation();
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69 | count++;
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70 | }
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71 | return null;
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72 | }
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73 |
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74 | /**
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75 | * Replies the index of a particular <code>child</code> with respect to its
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76 | * <code>parent</code>.
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77 | *
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78 | * @param parent the parent relation
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79 | * @param child the child relation
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80 | * @return the index of a particular <code>child</code> with respect to its
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81 | * <code>parent</code>; -1 if either parent or child are null or if <code>child</code>
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82 | * isn't a child of <code>parent</code>.
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83 | *
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84 | */
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85 | protected int getIndexForRelationChild(Relation parent, Relation child) {
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86 | if (parent == null || child == null) return -1;
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87 | int idx = 0;
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88 | for (RelationMember member : parent.getMembers()) {
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89 | if (!member.isRelation()) {
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90 | continue;
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91 | }
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92 | if (member.getMember() == child) return idx;
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93 | idx++;
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94 | }
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95 | return -1;
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96 | }
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97 |
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98 | /**
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99 | * Populates the model with a root relation
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100 | *
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101 | * @param root the root relation
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102 | * @see #populate(List)
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103 | *
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104 | */
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105 | public void populate(Relation root) {
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106 | if (root == null) {
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107 | root = new Relation();
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108 | }
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109 | this.root = root;
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110 | fireRootReplacedEvent();
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111 | }
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112 |
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113 | /**
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114 | * Populates the model with a list of relation members
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115 | *
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116 | * @param members the relation members
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117 | */
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118 | public void populate(List<RelationMember> members) {
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119 | if (members == null) return;
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120 | Relation r = new Relation();
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121 | r.setMembers(members);
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122 | this.root = r;
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123 | fireRootReplacedEvent();
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124 | }
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125 |
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126 | /**
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127 | * Notifies tree model listeners about a replacement of the
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128 | * root.
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129 | */
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130 | protected void fireRootReplacedEvent() {
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131 | TreeModelEvent e = new TreeModelEvent(this, new TreePath(root));
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132 | for (TreeModelListener l : listeners) {
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133 | l.treeStructureChanged(e);
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134 | }
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135 | }
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136 |
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137 | /**
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138 | * Notifies tree model listeners about an update of the
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139 | * trees nodes.
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140 | *
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141 | * @param path the tree path to the node
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142 | */
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143 | protected void fireRefreshNode(TreePath path) {
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144 | TreeModelEvent e = new TreeModelEvent(this, path);
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145 | for (TreeModelListener l : listeners) {
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146 | l.treeStructureChanged(e);
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147 | }
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148 |
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149 | }
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150 |
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151 | /**
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152 | * Invoke to notify all listeners about an update of a particular node
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153 | *
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154 | * @param pathToNode the tree path to the node
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155 | */
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156 | public void refreshNode(TreePath pathToNode) {
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157 | fireRefreshNode(pathToNode);
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158 | }
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159 |
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160 | /* ----------------------------------------------------------------------- */
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161 | /* interface TreeModel */
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162 | /* ----------------------------------------------------------------------- */
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163 | @Override
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164 | public Object getChild(Object parent, int index) {
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165 | return getRelationChildByIdx((Relation) parent, index);
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166 | }
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167 |
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168 | @Override
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169 | public int getChildCount(Object parent) {
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170 | return getNumRelationChildren((Relation) parent);
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171 | }
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172 |
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173 | @Override
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174 | public int getIndexOfChild(Object parent, Object child) {
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175 | return getIndexForRelationChild((Relation) parent, (Relation) child);
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176 | }
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177 |
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178 | @Override
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179 | public Object getRoot() {
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180 | return root;
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181 | }
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182 |
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183 | @Override
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184 | public boolean isLeaf(Object node) {
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185 | Relation r = (Relation) node;
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186 | if (r.isIncomplete()) return false;
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187 | return getNumRelationChildren(r) == 0;
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188 | }
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189 |
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190 | @Override
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191 | public void addTreeModelListener(TreeModelListener l) {
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192 | if (l != null) {
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193 | listeners.addIfAbsent(l);
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194 | }
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195 | }
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196 |
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197 | @Override
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198 | public void removeTreeModelListener(TreeModelListener l) {
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199 | listeners.remove(l);
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200 | }
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201 |
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202 | @Override
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203 | public void valueForPathChanged(TreePath path, Object newValue) {
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204 | // do nothing
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205 | }
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206 | }
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